GRAND FORKS — The public is invited to attend the 14th annual Northern Valley Police Week Memorial Service Wednesday, May 13, in Grand Forks' Optimist Park. In 1962, then President John F. Kennedy signed a proclamation designating May 15 as Peace Officers Memorial Day, and the week that date falls as National Police Week, according to a press release issued by the Grand Forks Police Department. For more than a decade, agencies such as local and …